Means for operating reciprocating conveyers or screens



V R. s. mcosszn. MEANS FOR OPERATING RECIPROCATING CONVEYERS 0R SCREENS.

APPLICATION FILED SEPT. H I916.

Patented Aug. 2, 1921 UNITED STATES PATENT OFFICE.

3:03am) s. :acoizsmw, or cnrcaeo, rumors, nssrenoa r0 .uconsnn 4 assumes,

, mconrom-rnn, or cnxcneo, rumors, A. conromrron.

arms i on ormrme ancrraocn'rme convnrnns on. some.

To all whom itmay concern:

Be it known that I, RICHARD S. JAoonsEN, a subject of the King of Norway, residin in the cit of Chicago, county of Cook, an State of llinois, have invented certain new and useful Improvements in Means for Operating ReciprocatingConveyers or Screens, of which the following is a specification.

' This invention relates to a novel mechani'sm for driving conveyers or screens with a reciprocating motion wherein theforward and backward strokes of each revolution, respectively, progressively'increase and diminish in. speed for the greater part of their travel. That is, this progressive acceleration or retardation is applied to approximatelytwo-thirdsof the-stroke, the last third being utilized in reversing and thereby reducing the shock which would occur in a sudden reversal.

Much time and study has been devoted to the reduction or elimination of this reaction or shock due to the reversal at the end of the strokes and as a result, heavy, expensive and com licated mechanisms have been devised, an in some cases heavy fly wheels and massive. foundations were provided. In all of these instances, the costly mechanisms and supporting structures would not permit the use of the same for conveying purposes, and in many installations the mechanisms were fractured due to such shock or slight deviation from the essential alinement of shafts or other parts. It is therefore, an object of this invention to overcome these disadvantages and to produce a mechanism of such character that will combine efiiciency and simplicity, and one that shall be low in original cost and maintenance to permit the adoption of the same for conveying purposes.

Among other objects and advantages are the following:

First: The conveying trough can be made in two sections actuated by mechanisms mounted on a single drive shaft, such mechanisms being arranged on said shaft in such manner that the momentum of the trough sections will be counter-balanced, thereby reducing the reaction to a minimum, and permitting the use of a lighter supporting structure or foundation at greatly reduced cost.

Second: With this apparatus, the material can be conveyed forward on one trough and Specification of Letters Patent. application filed September 11, 1916. Serial No.

Patented Au 2, 1921.

in reverse direction on the other trough, by arranging the troughs in stepped relation, one above the other and mounting their dr vlng mechanisms inopposite relative posltlons on the common drive shaft, thereby adaptmg this apparatus to screening and gradlng.

Third. A number of driving eccentrics can be mounted on and actuated by a common drive shaft. 1

Fourth: The driving shaft receives its impulse centrally and directlyv on the center l1 ne of the power driven pulley which eliminates any twisting efl'ect.

Flfth: The connecting pins for the link between the pulley and crank-arms are supported at both ends and are therefore in double shear which affords desirable stren h.

'To these and other objects my invention consists in the novel construction, combination, association and relative position of parts and members set forth in the followng specification and accompanying drawmgs, and more particularly brought out in the appended claims.

This particular motion may be obtained and imparted to the conveying trough or screen through the herein illustrated construction and arrangement which is one embodiment of my invention and which includes connecting rods extending from ordinary eccentric disks mounted on a nonuniformly rotating shaft carried eccentrically with relation to'the center of the two supporting bearings which also support the power driven pulley eccentrically to said shaft and which shaft has operative connection with said pulley by means of a crank arm rigidly mounted thereon and a llnk connecting the same to the pulley.

Referring to the drawings in which like reference characters indicate like or correspontling parts, Figure 1 is a sectional elevation of a mechanism embodying my invention taken on line 1--l of Fig. 2, and showing the connection to a pair of conveyers or screens partly shown. Fig. 2 is a half plan of Fig. 1; the conveyers or screens and mechanism being. symmetrical about the longitudinal center line. Fig 3 is a section taken on line 3-3 ofFig. 4, illustrating the power driven pulley and its connection to the non-uniformly rotating shaft. Fig. at is asectional view taken on line 4-4 of Fig. 3, illustrating the pulley, drive shaft, supportin bearings, crank arm and connecting, link. %ig. 5 is a view taken online 5-5 of Fig. 3 showing the link connecting pins in double shear.

Referring to the drawings, I provide a pair of conveyer troughs and 31mounted in stepped relation, the lower trough adapt ed if desired, to receive material from the above trough 30. As indicated on the drawings, the upper trough 30 conveys material in a forward direction and the lower trough 31 in an opposite or backwarddirection, thus especially adapting this arrangement to the grading of granular materials such as coal,

stone, and the like. The reciprocating troughs are mounted on rollers 32 or their equivalent, and have pivotal connection with connecting rods 33 extending from the sides thereof to ordina eccentrics 34 and 35 which are opposite y mounted on the nonuniformly rotating shaft 36 which imparts or transmits to the same the progressively accelerating and retarding motion respectively, for the greater part of each forward and backward stroke.

' portedat the ends by a pair of o It will be observed that the shaft 36 suprdinary bearings 37 and intermediately b a pair of special eccentric bearings 38 an 39 which support the shaft 36 eccentrically withrelation to'the center of the over-hanging mountings 38 and 39 upon which are loosely mounted the divided hub portions 40 and 40 of the power-driven pulley 40. Any number of spokes 40- may be rovided and arranged .in two sets as indicated in' Figs. 4 and 5, one set extending from each hub portion to the pulley rim 40 Centrally mounted with respect to the pulley and shaft (indicated in views 4 and 5) is the crank arm 41 which is keyed to the shaft 36 and which has operative connection with the pulley 40 through the cast steel link 42 and pins 43 and 44. The steel link 42 includes the sleeve 42 anda pair of parallelly disposed integral arms 42.

Attention is directed to the following:

First: The pins 43 and 44 which connect the cast link 42 with the crank arm 41 and the pair of spokes 40, are in double shear.

Second: The center of revolution of the uniformly rotating power-driven pulley 40 is placed to one side of the center of shaft 36 which rotates with progressive acceleration and retardation respectively for the greater part of each forward andbackward stroke of the connecting rods.

Third: The mechanism is symmetrical about the longitudinal center line of the troughs. It will be understood that to convert the conveyor troughs into screens it is only necessary to perforate the bottom plates as shown dotted and that in both cases the lineal speed with a comparatively quick reverse is imparted toward the end of each forward stroke whereby the material is advan'cedwhile the trough is drawn beneath in the op e direction.

While have shown and described in detail the exact manner m'which I prefer to carry out my invention and have illustrated and described a specific apparatus adapted to perform the results aimed at by my invention in the simplest manner, it is to be understood that I do not regard my invention as limited to these details of operation or construction, or mechanical equivalents, except in-so far as they are included within the terms of the following. claims, in which it is my intention to claim all novelty inherent in the invention in as broad a manner as is permissible in view of the prior art. e

The two bearings 39 and 38 are oppositely disposed and axially alined and spaced apart a distance to accommodate the crank arm 41 between them on the shaft, in the manner explained. The eccentrics 34 and 35 are each composed together with a reciprocating pitman 33 for each eccentric strap, so that each pitman is reciprocatedpositively in opposite directions by its allotted eccentric cam on the shaft. The horizontally. disposed conyeyers 30 and 31, as is well known, have what may be called a reverse motion conveying action, and are operatedin this manner in a very positive and reliable way by the'eccentrics on the shaft 36, which latter and the rotary driving member 40 are mounted, as shown and described, to rotate about parallel a'xes, with a connection from the rotary member to the shaft, so that the constant rotation of the pulley or rotary member is converted into a variable rotation on the part of said shaft. Sha 36 is eocentrically mounted to rotate in the bearings 38 and 39, so that the axis of said shaft is fixed relativel to the parallel axis of the pulley; and the ce between these two arms will do tion required for operating the eonveyers.

I claim:

1. Means for operating reciprocating conveyers or screens, comprising in combination, a pair of bearings, a unlformly' rotatmg power-driven pulley centrally mounted on said bearings, a non-uniformly rotating shaft extending through said bearings and through said pulley and to one side of the axis of revolution of the same, and connectmg means for said pulley and shaft, transmittmg to said shaft a motion substantially as described.

2. Means for operating reciprocating eonveyers or screens, including in combination a pair of bearings, a uniformly rotating nower-drlven pulley centrally mounted on as shown, of an eccentric. cam on the shaft and a strap on each cam,

d, of course, upon the exact character 0 the moof the axis of revolution of the same,

said bearings, a non-uniformly rotating shaft extending through said bearings and through said pulley and to one side of the axis of re olution of the same, and connect ing means arranged between said bearings for said pulley and shaft comprising a crank arm and link for transmitting to said shaft a motion substantially as described.

3. The combination in a mechanism for operating reciprocating conveyers, of a uniformly rotating power-driven pulley, a pair of bearings operating said pulley, a shaft, and means arranged between said bearings and operated by said pulley for transmitting to said shaft a non-uniform motion substantially as described, said means being centrally mounted with relation to said pulley.

4;. The combination in a mechanism for operating reciprocating conveyers, of a uniformly rotating power-driven pulley, a shaft, means operated by said pulley for transmitting to said shaft a non-uniform motion substantially as described, a plurality of pairs ofoppositely mounted eccentrics mounted on said shaft and arranged symmetrically about said pulley, and operating members connected to said eccentrics.

5. The combination in a mechanism for operating reciprocating conveyers, of a uniformly rotating power-driven pulley, a pair of bearings supporting said pulley, a single straight shaft extending through said bearings and through said pulley and to one side of the axis of revolution of the same, and means for transmitting to said shaft a nonuniform motion substantially as described including an arm rigid with said shaft mounted between said bearings, andmeans operativ'ely engaging said arm with said pulley.

6. The combination in a mechanism for operating reciprocating conveyers, of a uniformly rotating power-driven pulley having a divided hub, a straight shaft extending within the plane bounded by the circumference of said pulley and to one side of the axis of revolution of the same, a pair of bearings for supporting said pulley divided hub eccentrically to said shaft, said shaft extending into said bearings, and means for transmitting to said shaft a non-uniform motion substantially as described, including an arm rigid with said shaft and mounted between said divided hub, and means operatively connecting said arm with said pulley.

7. The combination in a mechanism for operating reciprocating conveyers, of a uniformly rotating power-driven pulley having a divided hub, a straight shaft extending within the plane bounded by the circumference of said pulley and to one side a pair of bearings for supporting said pulley hub eccentrically to said shaft, said shaft extending through said bearings, and means for transmitting to said shaft a non-uniform motion substantially as described, including an arm rigid with said shaft and mounted between said divided hub, means operatively connecting said arm with said pulley, a plurality of eccentrics mounted on said shaft, and operating members connected to said pairs of oppositely mounted eccentrlcs. 8. The combination in a mechanism for operating reciprocating conveyers, of a uni formly rotating power-driven pulley having a divided hub, a single straight shaft extending through said pulley and to one side of the axis of revolution of the same,

a pair of bearings supporting said hub and means for transmitting to said shaft a nonuniform motion substantially as described including an arm rigid with said shaft and mounted between said bearings, means operatively connecting said arm with said pul ley, a plurality of eccentrics mounted on said shaft, and operating members connected to said eccentrics.

9. The combination in a mechanism for operating reciprocating conveyers or screens, of a uniformly rotating pulley having a divided hub; a plurality of bearings supporting Said hub; a shaftsupported in said bearings and extending through said pulley eccentrically to the axis of revolution of the same; and means for transmitting to said shaft a non-uniform motion comprising an arm rigid with said shaft and mounted between said bearings, a link, and a pair of pins connecting said link with said pulley 10. The com ination in a mechanism for operating reciprocating conveyers or screens,

of a pulley having a hub divided in two portions and a set of spokes extending between each of said portions and the pulley rim; a pair of bearings supporting said portions; a shaft supported in said bearings and extending through said hub portions eccentricall to the axis thereof; and means for transmitting to said shaft a non-uniform motion comprising an arm rigid with said shaft and mounted between said bearings, a link extending between a air of spokes and having a forked extension embracing said lever, and means connecting said link with said spokes and lever.

11. mechanism for operating reciprocating troughs and in combination, a shaft; a pair of bearings for said shaft; a pulley having a divided hub mounted on said bearings eccentrically to said shaft; and means for transmitting a non-uniform motion to said shaft comprising an arm rigid with said shaft and mounted between said bearings, a forked link extending between said pulley and arm and connection pins in double shear connecting said pulley with said arm.

12. The combination in a mechanism for operating reciprocating conveyers or screens,

an arm rigid with said shaft, a link, and apair of pins connecting said link with said pulley and arm, said pins being in double shear.

13. The combination in a mechanism for operating reciprocating conveyers, of a uniformly rotating power-driven pulley, a shaft,

means operated by said pulley for-trans mitting to said shaft a non-uniform motion substantially as described, a plurality of pairs of eccentrics mounted on said shaft and arranged symmetrically about the center line of the conveyer, and operating members connected to said eccentrics.

14. The combination in a mechanism for o crating reciprocating conveyers, of a single shaft, a uniformly rotating powerdriven pulley mounted eccentrically with relation to said shaft,-means operated b said pulley for transmitting to said sha a non uniform motion substantially as described, a pair of eccentrics mounted on said shaft and arranged symmetrically about the center line of the conveyer, and operating members connected to said eccentrics.

15. The combination in a mechanism for operating reciprocating conveyers, of a uni-' formly rotating power-driven pulley, a shaft, means operated by said pulley for transmitting to said shaft a non-uniform motion substantiall as described, eccentrics mounted on said 5 aft and arranged symmetrically about the center line ofthe convreyer, and operatingmembers conneotedl to said eccentrics.

16. The combination, in a mechanism for operating reciprocating conveyers, of a uniformly rotating pulley, a plurality of oppositely mounted eccentrics arranged symmetrically with relation to the conveyer, and interconnecting means between said pulley and said eccentrics for transmitting to said eccentrics a non-uniform motion substantially as described.

17. The combination in a mechanism for operating reciprocating conveyers, of a uniformly rotating pulley, a plurality of eccentrics mounted symmetrically with relation to the conveyer, and interconnecting means between said pulley'and said eccentrics for transmitting to said eccentrics a non-unisaid eccentrics for transmitting to said,

eccentrics anon-uniform motion, substantially as described.

20. The combination of a zontally disposed reciprocating conveyer troughs having reverse motion conveying action, and a driving mechanism therefor including a single shaft driven with a nonuniform motion, and eccentrics on said shaft for driving said troughs.

21. The combination of a pair of horizontally disposed reciprocating conveyer troughs having reverse motion conveying action, and a driving mechanism therefor including a uniformly rotating pulley, a shaft driven with a non-uniform motion, and eccentrics on said shaft operatively connected to said troughs.

22. The combination of a rotary driving member, ashaft, means for supporting said member and shaft for rotation about parallel and relatively fixed axes, a crank arm on the shaft, and a link to connect said member to the end of said arm.

23. The combination of a pair of oppositely disposed and axially alined stationary cylindric bearings spaced apart a distance, a shaft eccentrically mounted to rotate in said bearings, a driving member mounted to rotate on said bearings, and a connection from said member to the shaft between said bearin s.

24. structure as specified in claim 23, in combination with eccentric; mounted on the shaft outside of said bearings.

In witness whereof, I have'hereunto subscribed my name this 1st day of September, 1916.

RICHARD S. J ACOBSEN.

'air of hori- 

